iOS 页面跳转后更改左边导航栏的文字还有箭头颜色_html/css_WEB-ITnose

LoginViewController *loginViewController =[[ LoginViewController alloc] init];
UINavigationController *nav=[[UINavigationController alloc]initWithRootViewController:loginViewController];

UIButton *leftBtn = [UIButton buttonWithType:UIButtonTypeCustom];

leftBtn.frame = CGRectMake(0, 0, 70, 37);
leftBtn.titleLabel.font=[UIFont systemFontOfSize:25.0];
[leftBtn setTitle:@"取消" forState:UIControlStateNormal];
[leftBtn addTarget:self action:@selector(dismissController) forControlEvents:UIControlEventTouchUpInside];

loginViewController.navigationItem.leftBarButtonItem =[[UIBarButtonItem alloc] initWithCustomView:leftBtn];
[self.navigationController presentViewController:nav animated:YES completion:nil];

更改箭头颜色：
self.navigationController.navigationBar.tintColor = [UIColor whiteColor];